SA node

SA node: The SA node (SA stands for sinoatrial) is one of the major elements in the cardiac conduction system, the system that controls the heart rate. This stunningly designed system generates electrical impulses and conducts them throughout the muscle of the heart, stimulating the heart to contract and pump blood. The SA node is the heart's natur...
Found on http://www.medterms.com/script/main/art.asp?articlekey=5402

SA node

sinoatrial node.
Found on http://www.encyclo.co.uk/local/21001
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